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MFC下MCI的使用播放音乐

2024-07-16 08:26:28   221人阅读

最近研究了一下MFC下的音乐的播放，主要使用了MCI

1.需要包含的库文件

在链接资源里（link）添加库文件VFW32.lib winmm.lib

 

2.包含的头文件

1 #include <mmsystem.h>2 3 #include "stdafx.h"4 5 #include "vfw.h"6 7 #include <digitalv.h>8 9 #pragma comment(lib,"winmm.lib")


3.需要调用的成员变量和成员函数的声明、定义

 1 class CMp3Dlg : public CDialog 2 { 3 // Construction 4 public: 5     CMp3Dlg(CWnd* pParent = NULL);    // standard constructor 6  7 // Dialog Data 8     //{{AFX_DATA(CMp3Dlg) 9     enum { IDD = IDD_MP3_DIALOG };10     CButton    m_Play;11     CString    m_Path;12     //}}AFX_DATA13 14     // ClassWizard generated virtual function overrides15     //{{AFX_VIRTUAL(CMp3Dlg)16     protected:17     virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support18     //}}AFX_VIRTUAL19 20 // Implementation21 protected:22     HICON m_hIcon;23 24     // Generated message map functions25     //{{AFX_MSG(CMp3Dlg)26     virtual BOOL OnInitDialog();27     afx_msg void OnSysCommand(UINT nID, LPARAM lParam);28     afx_msg void OnPaint();29     afx_msg HCURSOR OnQueryDragIcon();30     afx_msg void OnButtonOpenFile();31     afx_msg void OnButtonPlayMusic();32     afx_msg void OnButtonCyclePlay();33     afx_msg void OnMciNotify(WPARAM wParam,LPARAM lParam);34     //}}AFX_MSG35     DECLARE_MESSAGE_MAP()36 37 public:38     void CyclePlay();39     40 41 private:42     HWND m_video;43     BOOL Pause;44 45     MCIDEVICEID m_wID;46 };

4.添加消息响应

 1 BEGIN_MESSAGE_MAP(CMp3Dlg, CDialog) 2     //{{AFX_MSG_MAP(CMp3Dlg) 3     ON_WM_SYSCOMMAND() 4     ON_WM_PAINT() 5     ON_WM_QUERYDRAGICON() 6     ON_BN_CLICKED(IDC_BUTTON_OPEN, OnButtonOpenFile) 7     ON_BN_CLICKED(IDC_BUTTON_PLAY, OnButtonPlayMusic) 8     ON_BN_CLICKED(IDC_BUTTON_CYCLE_PLAY, OnButtonCyclePlay) 9     ON_MESSAGE(MM_MCINOTIFY,OnMciNotify)10     //}}AFX_MSG_MAP11 END_MESSAGE_MAP()

5.打开相应的文件
方法一：

 1 void CMp3Dlg::OnButtonOpenFile()  2 { 3     // TODO: Add your control notification handler code here 4     TCHAR szBuffer[MAX_PATH] = {0}; 5     BROWSEINFO bi; 6     ZeroMemory(&bi,sizeof(BROWSEINFO)); 7     bi.hwndOwner = NULL; 8     bi.pszDisplayName = szBuffer; 9     bi.lpszTitle = _T("从下面选择文件或者文件夹:");10     bi.ulFlags = BIF_BROWSEINCLUDEFILES;11     LPITEMIDLIST idl = SHBrowseForFolder(&bi);12 13     if (NULL == idl)14     {15         return;16     }17     SHGetPathFromIDList(idl,szBuffer);18 }

方法二：

 1 void CMp3Dlg::OnButtonOpenFile() 2 { 3     m_video = NULL; 4     if (m_video == NULL) 5     { 6         CFileDialog filedialog(TRUE,NULL,NULL,OFN_HIDEREADONLY,"MP3 Files (*.mp3)|*.mp3|"); 7         if (filedialog.DoModal() == IDOK) 8         { 9             m_Path = filedialog.GetPathName();10             UpdateData(FALSE);11         }12     }13 }

6.音乐的播放
方法一：

 1 void CMp3Dlg::OnButtonPlayMusic()  2 { 3     // TODO: Add your control notification handler code here 4     m_video = NULL;     5     if(m_video == NULL) 6     { 7         m_video = MCIWndCreate(this->GetSafeHwnd(), 8             AfxGetInstanceHandle(), 9           WS_CHILD | WS_VISIBLE|MCIWNDF_NOMENU,m_Path);10     }11     else12     {13         MCIWndHome(m_video);14     }15     MCIWndPlay(m_video);16     m_Play.EnableWindow(FALSE);17 }

方法二：

 1 void CMp3Dlg::OnButtonCyclePlay()  2 { 3     // TODO: Add your control notification handler code here 4     MCI_OPEN_PARMS mciOP; 5     DWORD dwReturn; 6  7      8     //ASSERT(m_wID == NULL); 9 10     mciOP.lpstrDeviceType = NULL;11     mciOP.lpstrElementName = m_Path;12     dwReturn = mciSendCommand(0,13                     MCI_OPEN,14                     MCI_OPEN_ELEMENT|MCI_WAIT|MCI_OPEN_SHAREABLE,15                     (DWORD)(LPVOID)&mciOP);16 17     if (dwReturn == 0)18     {19         m_wID = mciOP.wDeviceID;20     }21     else22     {23         m_wID = NULL;24     }25 26     CyclePlay();27 }28 29 void CMp3Dlg::CyclePlay()30 {31     MCI_PLAY_PARMS PlayParms;32     PlayParms.dwCallback = (DWORD)GetSafeHwnd();33     PlayParms.dwFrom = 0;34     //mciSendCommand(m_wID,MCI_PLAY,MCI_DGV_PLAY_REPEAT,(DWORD)(LPVOID)&PlayParms);35     mciSendCommand(m_wID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&PlayParms);36 }

7.循环播放
方法一：

 1 mciSendCommand(m_wID,MCI_PLAY,MCI_DGV_PLAY_REPEAT,(DWORD)(LPVOID)&PlayParms);

 1 //mciSendCommand(m_wID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&PlayParms);  

将上面的35行注释掉，使用34行

方法二：添加消息响应函数

 1 void CMp3Dlg::OnMciNotify(WPARAM wParam,LPARAM lParam) 2 { 3         if(MCI_NOTIFY_SUCCESSFUL == wParam) 4         { 5             //mciSendCommand(m_wID,MCI_CLOSE,0,NULL); 6             //CyclePlay(); 7             MCI_PLAY_PARMS PlayParms;             8             PlayParms.dwFrom = 0;             9             PlayParms.dwCallback = (DWORD)m_hWnd;            10             mciSendCommand(m_wID, MCI_SEEK,MCI_SEEK_TO_START, NULL);            11             mciSendCommand(m_wID, MCI_PLAY, MCI_NOTIFY, (DWORD)(LPVOID)&PlayParms);12         }13 }

以上所述经过测试！

 


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